Selection state of F-Curves is lost when resizing the Graph Editor.
The problem was that SIPO_TEMP_NEEDCHANSYNC was getting set in the graph_init()
callback, which gets called everytime the view resizes, and not just the very
first time this happens. However, setting this flag forces the selection state
to the updated/pulled from the scene data.
In the past, it was necessary to set this flag so that we could force F-Curve
colors to get initialised correctly. However, things probably changed at some
point, so this behaviour is no longer needed. At worst now, opening a new graph
editor may not show F-Curve selection correctly synced with the viewport, though
that's easily worked around by reselecting whatever it is in the 3d view.
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